Excavator-bucket.



0. J. MARTINSON.

EXCAVATOR BUCKET.

APPLICATION FILED SEPT. 28, 1910.

Patented Nov. 22, 1910.

2 SHEETS-SHEET 1.

0. J. MARTINSON.

EXCAVATOR BUGKET.

APPLICATION FILED SEPT. 23, 1910.

Patented Nov. 22, 1910.

2 SHEETS-SHEBT Z.

DWI

ahead by thehauling Cabl.' Thebucket is supported by trunnions 6, in a bail 7, which inturn issuspended by t-hehoisting cable 8. .Th'ehaulingcable 9 isdivided in front of UNITED STATES PATENT OFFICE.

oscAR nirmn'rinson, or CHICAGO, rumors, .ASSIGNOB} we when MACHI E communes cnrceeo, ILLINOIS, A CORPQBATION or ILLINOIS.

x Specification of Ltterslfitnt.

nxjcavAron-nucnnr.

" Application filed September 28, 1910.. Serial 80. 584,365.

To all whom it mag concern: u

Be it known that I, OSCAR J. MARTINsoN, a cltizen of the United States of America,

and a resident of Chicago, countyof Cook,

State of Illinois,*have invented certain new and useful Improvements" in Excavator- Buckets, of which-the following is a specification.

The main'objects of this invention are to provide an improved form of operating mechanism for excavator buckets-whereby theswinging of the bucket-between itsload carryingand dumping positions may be controlled bythe tension on the hauling cable; and to provide'm'echanism ofthis kind in which the controlling line-which connects the operating mechanism'with the hauling line will have a straight lead without requiring it to pass over pulleys.

A specific construction illustrating the present invention is shown in the" accou1 'panying drawings, in which:

Figure 1 is a sideelevation of the bucket in its load carrying position. Fig.2 is a fragmentary detail of a modified construction with the bucket represented in the po 'sition of Fig. 1." Fig.3 is'a'r'ear elevation of the device shown in Fig. 1. "Fig. 4 is a side elevation showing various pos1tions of the bucket and its operating mechanism,

with respect to supported.

In the constructioirshown, the derrick is of usual type,*andcomprises a mast 1, a

boom-'2, and the upper end of the boom is the derrick from which it is supported by means of a cable 3 in the-usual manner. The bucket 4 is open at the front, and is provided with acutting edge 5 at'the front of its bottom. The side walls are extended forward of the cutting edge, and their lower front corners are cut away, so

'that--wl1enthe bucket is lowered to the ground, it willcome to'rest in such position that, its cutting edge will cut'into the surface of the ground when the bucket is pulled the bucket so as to provide two parts-10,

which are respectively connected. to opposite sides of; the front of the. bucket 4, and a third part 11, which wi ll hereinafter be reing cable 9 is connected to the parts 10 and 11 by means of a triangular plate 12.

- The angular position of the bucket with respect to the supportin bail iscontrolled by a lever 13, which is fulcrumed at ll'OIlthe bail, and which has a rearwardly extending arm adapted to coact with the rear part of the bucket to prevent the same from tilting forward to its dumping position; there being, in the form shown 1n Fig. 1, a shoulder Q15 in-the form of an anti-friction roller on the lever, and a coacting' cam track 16 on the bucket. A

In'the modified form shown in Fig. 2, the shoulder is on the bucket, and consists of the anti-friction rollerl'Z, while the cam track is replaced by acam surface 18 on the lever: In .all other respects, the two specific forms herein shown are alike." Thelever 13 has apart extending-forward from its fulcrum 14, in the form of agear sector 19, and there is a second lever 20 fulcrumed at 21 on the bail and having one arm in the form of a gear sector 22, meshing with the gear sector 1-9. I The other arm of the lever 20 extends forward andupward, and is connected to thecontrolling line 11.

The operation'of the device shown will be best understood from'Fig. 4, in which the bucket is shown at A in its dumping position, at B in its loading position, and at G in its load carrying POSltlOD. On account of the fact that the bail'is pivoted tothe bucket behind the center of gravity thereof, the bucket will be normally urged-by gravity to that position with respect to its "bail which is represented at A, provided there is Patented Nov. 22, 1910. v

no strain uponthe hauling cable to render the controll ng mechanism operative. While the bucket is suspended in this position, a

strain upon the hauling cable 'will not tilt the bucket in the bail, and the bucket may therefore be guided by both the hauling and hoisting cables so as to be brought to the ground at any desired position. i

When the hoisting cable'islowered so as to drop the bucket to the ground, the-for- ,wardly extending sides of the bucket cause it to settle so as to rest upon-its'bottom in the form shown at B inFig. 4:; and the bail and the controlling mechanism also assume the position shownat B, as soon as the slack is taken out of the hauling cable 9. Durin the-act of loading-the bucket, is pulled;

i slack. If the hauling cable is no'w graduiw'hile the trolling line 1 1','and the strain on the cable 8 therefore tips the front edge of the bucket upward so that its cutting edge is lifted out of,the ground, and a continued strain upon the cable Sgcauses the bucketto be lifted; in the position represented at C in Fig. 4, in which case all of the strain on the hauling cable 9. will be resisted by the con trolling line 11, and the parts 10' will be ally-paid out as the hoisting cable is hauled I in, the bucket will be carried outward toward the: end of-. the boom. If the strain on the cable 9 istllenreleased, the lever. 13 will no longer be capable of preventing the tip- I ping of the bucket, and will be pushed pward, as the bucket swings on its tl'unni ns to its dumping position, as represented at A.

is. i As jcamtrackslfi or 18 coact with the res ective may be seen from Figs. 1 and 2,1 the rollers or 17, to permit ofconsi erable ,angular tiltin of the bucket with respect to its-bail .wi bout letting goof the load.

When the roller 15; passesthe crest 23 of the .camsurface 16, it is 'no. longer capable of i reventing the further swinging of the V ucket, and it simply rides along the surface .24; "and-over theback end of the bucket. In the form shown in Fig.2, there is a. similar crest or heel 25, which determines the limiting angular position of the bucket, beyond which-the lever 13 is no lon er capable'of preventing the dumping of t e bucket. In

this case, the heel 25 rides over the surface 26. of the shoe whichcarries the roller .17.

This surface is preferably tangent to the periphery of the roller 17 so as to be in effect an. unbroken continuation thereof.

Although the ,foregoing. description, and drawings have for the sake of clearness and .concis'eness been confined to but one spe-' embodiment of thisinventionuand one modification, it will be understood that numerous other details of the construction shown may be altered or omitted without departingfrom the spirit of this invention, as defined by the following claims.

I claim I w I v 1.. In an excavator, the "combinationof. a

j bucket, a bail pivoted thereto back of the center of gravity, hoisting means connected to said bail for lifting the bucket, a hauling 1 cable connected with the front of the bucket,- v Q a lever connected with said haulingfi-dtblemdfulcrumed onfjsaid bail, means:--o11;i;.said-; bucket providing a cam surface ,bail and .adapted to coact with saidllever 'ffo controlling the relative angular 'tionsef said bucket'and bail. pom

ere;

2, In an excavator, thecombination of a bucket, a pivoted thoreto;.- back of the "center of gravit hoisting connected to said bail for ing-the bucket;;a,hauling cable connected withthe' fronti-ofthmbucket, 0 a lever connected Withsaid-hauIing' cabIe' and fulcrumed on said arollercarried. by said; lever, means on said 'b'ucket providing acam surface'behind said" bail and" adapted to coact with said roller for controlling the. relative, angular positions of said bucket and hail. "I .3. In an excavator, the combination of a bucket, a'bail pivoted thereto backofy'the 3 ,center of gravity, hoisting means connected so with said bail for lifting said bucket, .11 hauling cable operatively;'connectedto the front of said bucket, a gear-sector journaled' on said bail, means :operatively connecting said sector with .said hauling cable an adapted to control the angular posit'1on of said sector on its axis through-the tension on said hauling cable and a second gear sector meshing with the firstand' adapted to control the relative angular positions of said bucket and bail. 1

4a. In an excavator, the combination of a bucket, a bail pivoted thereto at a point back of its center of. gravity, a hauling cable operatively connected to the front of sa1 d bucket, hoisting means connected to said bail ,for liftin said bucket, a pair of'levers separately fu crumed on sai bail and o ra- .tively connected, one of said levers m adapted to engage the rearward part of said bucket fer controlling the angular movement thereof with respect to said bail and said other lever being connected to saidhauling, cable and ada ted to. control the movements of said first ever throu h variation of the strain on said hauling ca le.

5. In an excavator, the combination of "a bucket, a bail pivoted thereto at a point back of its center of gravity, a hauling cable- I operatively connected 'to the front of said 11 bucket, hoisting means connected to said bail for lifting said bucket, a pair of levers. separately fulcrumed .onsaid bail and operatively connected, intermeshing gear sectors respectively connected to said levers, 115

one of said levers havinga forwardly extending arm connected to said hauling cable,

and the other said lever having a rearwar'dly extending arm adapted to coact with the rearward part ofthe bucket for contro the relative angular positions of sai bucket and, bail, whereb ,the tilting 'of the bulelket' may be controll ed lay-tho hauling" ca e.-

j .6. anv excavator, {ltheflcombination of a bucket; a pivoted thereto .-at= a. point eekil it e wrto gfiw yiflauling cable operatively fieonnec edi to the. front "of, said bucket',1ho1st" arr |eansaconnected-to-said-lmil I i for bucket, a. nf www.1

separately fulcrumed on said bail and operatively connected, intermeshing gear sectors respectively connected to said levers, one of said levers having a forwardly extending arm connected to said hauling cable, and the other. said lever having a rearwardly extending arm means whereby relative angular positions of said bail and bucket may be controlled by said rearwardly extending arm, sa1dn'1eans comprising a shoulder and a coacting cam surface, whereby said bucket may be secured against dumping throughout a considerable range of angular movement on its pivotal axis, and whereby the tilting of the bucket may be controlled by the hauling cable.

7. In an excavator, the combination of a bucket, a bail pivoted thereto at a point back of its center of gravity, :1. hauling cable operatively connected to the front of said bucket, hoisting means connected to said bail for lifting said bucket, a pair of levers separately fulcrumed on said bail and opera tively connected, intermeshing gear sectors respectively connected to said levers, one of said levers having a forwardly extending arm connected to said hauling cable, and the other said lever having a rearwardly extending arm, a shoulder on said rearwardly extending arm, and a cam surface on said bucket adapted to coact With said shoulder to prevent said bucket from swinging t6 its dumping position, said cam surface being of such form and extent as to control the tilting of said bucket throughout a considerable ran e of angular movement thereof.

Signe at Chicago this 22nd day of September 1910.

OSCAR J. MARTINSON; Witnesses EUGENE A. RUMMLER, EDWIN PHELPS. 

